Online MCQs Quiz Unit-8: Waves

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HSSC-1 (Class-11) Physics (New Book/KPK Text Board, Peshawar)

1. When a wave goes from one medium to another medium, which one of the following characteristics of the wave remains constant?

10 points

A. Velocity

B. Frequency

C. Wavelength

D. Phase

Clear selection

2. When a transverse wave is reflected from the boundary of a denser to a rarer medium, it under goes a phase change of

10 points

A. θ

B. 𝝅/2

C. 𝝅

D. 2𝝅

Clear selection

3. If the tension in the string is doubled and its mass per unit length if is reduced to half. Then the speed of transverse wave on it is

10 points

A. Doubled

B. Halved

C. Constant

D. One fourth

Clear selection

4. Which one of the following properties is not exhibited by the longitudinal waves?

10 points

A. Reflection

B. Interference

C. Diffraction

D. Polarization

Clear selection

5. A sounding source and a listener are both at rest relative to each other. If wind blows from the listener towards the source, then which one of the following of sound will change?

10 points

A. Frequency

B. Speed

C. Phase

D. wavelength

Clear selection

6. Which one of the following factors has no effect on the speed of sound in a gas?

10 points

A. Humidity

B. Pressure

C. Temperature

D. Density

Clear selection

7. There is no net transfer of energy by particles of medium in :

10 points

A. Longitudinal wave

B. Transverse wave

C. Progressive wave

D. Stationary wave

Clear selection

8. Which one of the following could be the frequency of ultraviolet radiation?

10 points

A. 1.0 x 10⁶ Hz

B. 1.0 x 10⁹ Hz

C. 1.0 x 10¹² Hz

D. 1.0 x 10¹⁵ Hz

Clear selection

9. When a stationary wave is formed then its frequency is

10 points

A. Same as that of the individual waves

B. Twice that of the individual waves

C. Half that of the individual waves

D. √2 that of the individual waves

E. Triple that of the individual waves

Clear selection

10. The fundamental frequency of a closed organ pipe is f. If both the ends are opened then its fundamental frequency will be

10 points

A. f

B. 0.5f

C. 2f

D. 4f

Clear selection

11. If the amplitude of a wave is doubled, then its intensity is

10 points

A. doubled

B. halved

C. quadrupled

D. one fourth

Clear selection

12. A sound source is moving towards stationary listener with 1/10th of the speed of sound. The ratio of apparent to real frequency is :

10 points

A. 11/10

B. (11/10)^2

C. (9/10)^2

D.(10/9)

Clear selection

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